More than 150 Constituency Associations are demanding that Labour support calls for a second poll and the issue is set to be formally voted on tomorrow.

Mr Corbyn said he would be "bound" by any formal decision but refused to say whether he would support leaving the EU.

Len McCluskey, the general secretary of Unite - the country's biggest trade union and Labour's main financial backer - yesterday attempted to block the formal adoption of the referendum plan by demanding that any vote should not include a question about staying in...